The Chesapeake Bay Bridge-Tunnel is a 20 mile long series of bridges and tunnels that connect Virginia Beach/Norfolk to Virginia's Eastern Shore. The project is an engineering marvel; besides supporting vehicular traffic, the tunnels allow sea-going vessels passage into and out of the bay. A great deal of information is given on the project's home page, including a map of the surrounding area,...

Great Structures of the World is unlike similarly themed Web sites in that it does not focus on a single type of structure. Skyscrapers, bridges, tunnels, and even more exotic human creations are included in this information and picture archive. Users can browse through structures in Asia, Canada, Europe, the U.S., and elsewhere. Features include the world's largest indoor ski area, the world's...

How do you build a tunnel under Boston Harbor? Very carefully, of course. This remarkable digital archive from the University of Massachusetts-Boston brings together photographs that document the construction of the first Boston Harbor Tunnel, which was later renamed the Sumner Tunnel. This key part of Boston's infrastructure was constructed to handle automobile traffic from the North End of...